The Media & Text Block provides and easy way to add a two-column layout consisting of text content and a media file, such as an image or video. You have the choice of showing the media on the right or on the left by using the Show media on left (Columns Block Show Media on Left) or the Show media on right (Columns Block Show Media on Right) icons located on the Block Toolbar. The text content can only consist of Paragraph, Heading, List or Button Blocks.
Once you’ve added your content to your block, there is an option in the Settings Sidebar to choose whether you would like the content stacked when viewed on smaller devices (i.e. media on top of content or vice-versa, depending on the layout you’ve chosen).